shotGroups: Analyze Shot Group Data

Analyzes shooting data with respect to group shape,
precision, and accuracy. This includes graphical methods,
descriptive statistics, and inference tests using standard,
but also non-parametric and robust statistical methods.
Implements distributions for radial error in bivariate normal
variables. Works with files exported by 'OnTarget PC/TDS',
'Silver Mountain' e-target, 'ShotMarker' e-target, or 'Taran',
as well as with custom data files in text format.
Supports inference from range statistics like extreme spread.
Includes a set of web-based graphical user interfaces.